Bushing for electric tubular insulation.



UNITED STATES PATENT ernten.

CARL M. WHEELLCK, F MILWAUKEE, WISCONSIN, ASSIGN'OE TO NEW IRGCESS SPECIALTY COMPANY, A CORPRATION 0F WISCONSIN.

Specificationv or" Letters Eatent.

BUSHING- FOR ELECTRIC T UBULAR INSULATIN.

Patented Nor-J. 14, 19i6.

Gontinuaton of application Serial No. 758,74,iled Aprile, 1913. This application filed April 3G, 19155. Serial No. 24,840.

To all ihk-0m' n 'may concern.'

Be it known that I, CARL M. WirnnLooir, of Milwaukee, Wisconsin, have invented a Bushing for Electric Tubular insulation, of which the following is a specification.

My invention relatesto means for holding in place at outlets and other points a flexible tubing for electric wires' such as that known to the trade as circular loom,y being a tube woven of textile materials and,

saturated,l with insulating com-pounds.

- My Objectis to provide a means for se curely attaching the tubingto the edges of openings such as those in cutout boxes, the

wall of which isath-in metal plate; and to vprovide-a"means, "which is readily putin 'plafvvvithout the. use'of tools, but'cannot y"become lOlQSordetached of itself. 1 Further@ aim Ito provide such a device as the'ppening.

willnot puncture or injure the tubing, and

therein, showing the tubingl passing through the hole and my device in position; the device shown in this ligure being of the nonr'emovable type; and Fig. 3 is ,a side elevation, with one side in section, of a bushing shown separately, that here shown being of used.

the removable type.

In these dra ings each reference letter or numeral refers to the saine part wherever The device, the two forms of which are designated respectively, a and a in the drawings, is Inade in one piece, formed 'of sheet metal andsplit along one'side as shown at t. It is of such'diameter as to -fit neatly over the fcircular loom or other flexible tubing c, which latter is shown passing through the side d ofen outlet box or other opening and contains an electric wire e. Around the periphery near the middle of its length, and

preferably closer to one end than the other, 1s formed a channel-shaped depression or groove 7 the width of which is substantially equal to the thickness of the metal Z sur? rounding the hole,v or slightly greater. The bottom .of this channel is made preferably parallel to the axis, and one edge thereof. g, (the left hand edge in the drawing) substantially at right angles thereto. The

inside diameter greater than the outside 'of the flexible tubing c and stands tromto a sharp edge, or is provided with a number of sharp points or teeth h as preferred,

which bite into the tubing suiiiciently to en? gage lirmlytherewith and 4prevent it from slipping longitudinally. The other end of the bushing is preferably plain, and the surface from this end of the groove f is conical, or tapers on a slight angle.

The bushing is made of resilient `metal and the bottom of the `depression f when the bushing is fr'ee stands at a slightly greater diameter than that of the hole in the plate d. In order to place it in position, the bushing is simplyv slipped over the tubing c to the proper point (being held apart it necessary sufficiently to enable the teeth or sharp edge h to slide over it), and the bushing is then pushed into ythe hole from the# left hand side of Fig. 2. The end of the bushing is of such diameter as to readily pass into the hole, and as the bushing is pushed in the edge of the hole presses the bushing together and causes the teeth orlsharp edge 7L to bite thereinto, at the saine 'time pressing down the bushing resiliently until the depression f snaps into the hole and engages with the sides thereof, and will be held in such position by the resiliency of such de`- pression so that the tubing cannot be moved either way.

lf now it is desired to make the bushing non-removable, the right hand edge of the depression f is made at right angles to the axis as shown in Fig. Q; but it the bushing is to be removable, it may be :made sloping as shown .at i in Fig. 3. The bushing in Fig.

bushing is made barrel-shaped, converging 'at the ends so that this depression has an rocY 2 could still be removed by using a. special tool or appliance to compress the bushing, but the bushing in Fig. 3 can be removed without any tool by simply forcing it longitudinally toward the left against the side of the hole, but it is understood that the slope would be such as to require more force than any tendency of the tubing to move Would exert. It will, of course, be understood that the bushing as shown is capable of being slid into the hole in the plate (Z from either direction, as in the drawing both ends of the bushing are made conical, but it is not necessary to adhere to the Vprecise form or dimension shown, and modifications within the scope of my invention will readily suggest themselves to those skilled lin the art.

l claim as my invention. :vh

1. A self-sustaining device ot; the class and for the purpose descr-ibed, comprising a normaily-expanded tubular member slottedalohg one side throughout its length and having` intermediate its ends two opposite facing abrupt abutment-faces to prevent longitudinal movement of the member when engaged in an opening, there being also inclined surfaces ,leading from the ends of said member to the top olf the respective abutment-faces thereby causing the member to be circumferentially compressed by eneflwise movement of saidmember by engagement with the walls of an opening which latter has a diameter smaller than the greater diameter of said tubular member, said tubuk lar member being frictionally retained with the said abutment faces embracing the said walls by the outward expansion of said member, .substantially as described.

2. device of the class and for the purpose described, comprising a tubular meinber slotted along one side throughout its length and having intermediate its ends two oppositely facing abrupt abutment faces to scribed.

preventlongitudinal movement of the member when engaged in an opening, said member having at one end an inwardly project ing circumferential edge to bite into a tube held in saidv member, substantially as de- A device of the class and forq the purpose described, comprisinga barrel-slmped tubular member slit along one side and having some compressive resiliency, said member having intermediate betvv'ecn its ends l two oppositely facing abrupt abutment faces Separated from each other by the thickness of a plate into a circular hole in which said member is adapted to fit, and said faces being adapted to engage opposite sides of the plate, thereby preventing the bushing from longitudinal motion in said hole when it is placed therein with said abutment facesas described. .f

4. A device lof the class and purpose described, comprising a resilient tubular member slotted lalong one side throughout its length and having tvvo oppositely facing abrupt abutment faces spaced apart a relatively shortmdistance compared with the length of the member and adapted to-pre vent longitudinal movement of the member when engaged in an opening, said member having an inwardly projecting portion adapted to bite intoa tube held in said member substantially perpendicularly to the surface of said tube.

A device of the class and purpose described, comprising a resilient tubular memberrslotted along one side throughout its length and having intermediate its ends two oppositely facing abrupt abutment faces to prevent longitudinal movement of the member when engaged in an opening, said memhe:L having an inwardly projecting portion adapted to bite into a tube held in said member, substantially perpendicularly to the surface of said tube.

6. A device of the class and purpose described, comprising a resilient tubular member slotted along one side throughout its length and having two oppositely facing abrupt abutment faces spaced apart a relatively short 'distance compared With the length of the member and adapted to prevent longitudinal movement of the member when engaged in an opening, said member having portions projecting inwardly from the body of sail member adapted to bite into a tube held in said member.

In testimony whereof I have. hereunto signed my name in the presence of the two subscribing witnesses.

y CARL M. VHEELCK.

TilVitnesses:

Roms G. Priv/reenA JOHN lv'lonnow. 

